科学家很久就注意到在大量的自然出生中有季节性的变化。
Scientists have long noted that there are seasonal variations in the number of natural human births.
分析了非对称连跨式节能温室内温度的空间分布及季节性的变化趋势。
In this paper the space distribution of temperature and the seasonal change in unsymmetrical multi-span greenhouse were analyzed.
内河涌的氨氮污染逐年严重，并呈现季节性的变化，已成为最主要的污染因子。
The pollution of ammonia nitrogen is serious year by year in inner-river and becomes the main pollution factor though its concentration varies with different seasons.
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